Refactor the windows policy provider to use AsynchronousPolicyProvider.

chrome/browser/policy/configuration_policy_loader_win.h

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_LOADER_WIN_H_
+#define CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_LOADER_WIN_H_
+#pragma once
+
+#include "base/object_watcher.h"
+#include "base/waitable_event.h"
+#include "chrome/browser/policy/asynchronous_policy_loader.h"
+
+namespace policy {
+
+// Keeps watch on Windows Group Policy notification event to trigger a policy
+// reload when Group Policy changes.
+class ConfigurationPolicyLoaderWin
+    : public AsynchronousPolicyLoader,
+      public base::ObjectWatcher::Delegate,
+      public MessageLoop::DestructionObserver {
+ public:
+  ConfigurationPolicyLoaderWin(
+      AsynchronousPolicyProvider::Delegate* delegate,
+      int reload_interval_minutes);
+  virtual ~ConfigurationPolicyLoaderWin() {}
+
+ protected:
+  // AsynchronousPolicyLoader overrides:
+  virtual void InitOnFileThread();
+  virtual void StopOnFileThread();
+
+ private:
+  // Updates the watchers and schedules the reload task if appropriate.
+  void SetupWatches();
+
+  // Post a reload notification and update the watch machinery.
+  void Reload();
+
+  // ObjectWatcher::Delegate overrides:
+  virtual void OnObjectSignaled(HANDLE object);
+
+  // MessageLoop::DestructionObserver overrides:
+  virtual void WillDestroyCurrentMessageLoop();
+
+  base::WaitableEvent user_policy_changed_event_;
+  base::WaitableEvent machine_policy_changed_event_;
+  base::ObjectWatcher user_policy_watcher_;
+  base::ObjectWatcher machine_policy_watcher_;
+  bool user_policy_watcher_failed_;
+  bool machine_policy_watcher_failed_;
+
+  DISALLOW_COPY_AND_ASSIGN(ConfigurationPolicyLoaderWin);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_LOADER_WIN_H_